For years the construction industry needed new materials and the answer has been polished concrete as a continuous flooring (with expansion joints), this new material has managed in a very short time to be an important part of lowering the costs of reforms and It is also an essential material in some sectors such as parking floors and even operating rooms, where they need a very high degree of hygiene.
Polished concrete floors (polished cements) have a degree of thickness that gives them resistance characteristics similar to a screed. The colors with polished cements are more natural, since they do not use pigments. There are infinite combinations of both color and shape. Without cracks, polished cements, having a good thickness, do not show cracks and even have a great ability to bridge existing cracks in the floor. But they will need your expansion joints.
EN 
ES